I believe that your friend only sees Bitcoin and crypto from negative sides. And well, let it be because that is what is in his thought.
However, you can also talk about whatever you know about crypto from positive sides, based on the trusted sources, so that the information will be balanced. And if there is something wrong with what he said, just tell the truth and also make the clarification of the judgement with the source.
1. He thinks this is a casino. Only those who open the casino and the lucky ones can make money. Don't indulge in gambling and don't be blinded by the deviation of survivors;
He may mean about "gambling" because he is not sure when someone is buying crypto, the market will be really increasing or not. He thinks that it is likely gambling because cannot ensure or guarantee the future price that will be rising up or getting profits from it.
This may be true, but not exactly true. It will be only gambling if we don't know the exact way of investing or trading if we don't learn if we only follow others, and if we only make it based on luck to get profits.
5. He believes that Bitcoin is essentially a religion, so it's okay to be bullish, but it's nonsense to talk about blockchain killer applications.
Bitcoin is not a religion.
And is a religion bullish or bearish?

and some of his opinion is only from one side view, I think that you should let him know and broaden his mind about crypto
